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The Single UNIX &reg; Specification, Version 2<br>
Copyright &copy; 1997 The Open Group

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<h4><a name = "tag_000_005_086">&nbsp;</a>NAME</h4><blockquote>
fileno - map a stream pointer to a file descriptor
</blockquote><h4><a name = "tag_000_005_087">&nbsp;</a>SYNOPSIS</h4><blockquote>
<pre><code>

#include &lt;<a href="stdio.h.html">stdio.h</a>&gt;

int fileno(FILE *<i>stream</i>);
</code>
</pre>
</blockquote><h4><a name = "tag_000_005_088">&nbsp;</a>DESCRIPTION</h4><blockquote>
The
<i>fileno()</i>
function returns the integer file descriptor
associated with the stream pointed to by
<i>stream</i>.
</blockquote><h4><a name = "tag_000_005_089">&nbsp;</a>RETURN VALUE</h4><blockquote>
Upon successful completion,
<i>fileno()</i>
returns the integer value of the file descriptor associated with
<i>stream</i>.
Otherwise, the value -1 is returned and
<i>errno</i>
is set to indicate the error.
</blockquote><h4><a name = "tag_000_005_090">&nbsp;</a>ERRORS</h4><blockquote>
The
<i>fileno()</i>
function may fail if:
<dl compact>

<dt>[EBADF]<dd>
The
<i>stream</i>
argument is not a valid stream.

</dl>
</blockquote><h4><a name = "tag_000_005_091">&nbsp;</a>EXAMPLES</h4><blockquote>
None.
</blockquote><h4><a name = "tag_000_005_092">&nbsp;</a>APPLICATION USAGE</h4><blockquote>
None.
</blockquote><h4><a name = "tag_000_005_093">&nbsp;</a>FUTURE DIRECTIONS</h4><blockquote>
None.
</blockquote><h4><a name = "tag_000_005_094">&nbsp;</a>SEE ALSO</h4><blockquote>
<i><a href="fdopen.html">fdopen()</a></i>,
<i><a href="fopen.html">fopen()</a></i>,
<i><a href="stdin.html">stdin</a></i>,
<i><a href="stdio.h.html">&lt;stdio.h&gt;</a></i>,
<a href="stdio.html">Standard I/O Streans</a>.
</blockquote><h4>DERIVATION</h4><blockquote>
Derived from Issue 1 of the SVID.
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UNIX &reg; is a registered Trademark of The Open Group.<br>
Copyright &copy; 1997 The Open Group
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